Question

a ray of light makes an angle of 50 degree with the surface S1 of glass slab, it's angle of incidence is

Answer 1

Angle X = 50°.

We also know from the second law of reflection that, Angle of incidence (i) = Angle of Reflection (r) .

And, The angle of a straight line is 180°.

Therefore, 50°+ i + r + 50° = 180°

=> 100°+i+i = 180° (since i=r)

=> 2i = 180°-100°

=> i = 80°÷2

=> i = 40°

Therefore, angle of incidence is 40